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  • Book Overview & Buying Learning Node.js for .NET Developers
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Learning Node.js for .NET Developers

Learning Node.js for .NET Developers

By : Cummings
4 (2)
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Learning Node.js for .NET Developers

Learning Node.js for .NET Developers

4 (2)
By: Cummings
Buy this Book

Overview of this book

Node.js is an open source, cross-platform runtime environment that allows you to use JavaScript to develop server-side web applications. This short guide will help you develop applications using JavaScript and Node.js, leverage your existing programming skills from .NET or Java, and make the most of these other platforms through understanding the Node.js programming model. You will learn how to build web applications and APIs in Node, discover packages in the Node.js ecosystem, test and deploy your Node.js code, and more. Finally, you will discover how to integrate Node.js and .NET code.
Table of Contents (16 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
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1
1. Why Node.js?
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1. Why Node.js?
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What is Node.js?
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Why JavaScript?
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When to use Node.js
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Summary
2
2. Getting Started with Node.js
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2. Getting Started with Node.js
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Installing and running Node.js
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Choosing an editor
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Using an application framework
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Summary
3
3. A JavaScript Primer
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3. A JavaScript Primer
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Introducing JavaScript types
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Functional object-oriented programming
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Summary
4
4. Introducing Node.js Modules
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4. Introducing Node.js Modules
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Organizing your codebase
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Creating modules in Node.js
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Defining a directory-level module
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Implementing an Express middleware module
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Summary
5
5. Creating Dynamic Websites
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5. Creating Dynamic Websites
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Handling user-submitted data
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Communicating via Ajax
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Implementing other data operations
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Summary
6
6. Testing Node.js Applications
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6. Testing Node.js Applications
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Writing a simple test in Node.js
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Structuring the codebase for tests
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Writing BDD-style tests with Mocha
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Using Chai for assertions
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Creating test doubles
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Testing an Express application
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Full-stack testing with PhantomJS
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Summary
7
7. Setting up an Automated Build
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7. Setting up an Automated Build
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Setting up an integration server
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Automating the build process with Gulp
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Checking code style with ESLint
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Gathering code coverage statistics
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Running integration tests from Gulp
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Summary
8
8. Mastering Asynchronicity
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8. Mastering Asynchronicity
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Using the callback pattern for asynchronous code
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Writing cleaner asynchronous code using promises
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Combining asynchronous programming patterns
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Summary
9
9. Persisting Data
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9. Persisting Data
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Introducing MongoDB
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Using MongoDB with Express
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Introducing Redis
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Building a user ranking system with Redis
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A note on security
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Summary
10
10. Creating Real-time Web Apps
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10. Creating Real-time Web Apps
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Understanding options for real-time communication
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Introducing Socket.IO
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Scaling real-time Node.js applications
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Integrating Socket.IO with Express
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Directing Socket.IO messages
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Testing Socket.IO applications
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Organizing Socket.IO applications
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Summary
11
11. Deploying Node.js Applications
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11. Deploying Node.js Applications
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Working with Heroku
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Deploying from Travis CI
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Further resources
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Summary
12
12. Authentication in Node.js
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12. Authentication in Node.js
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Introducing Passport
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Using Express sessions
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Implementing social login
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Allowing users to log out
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Adding other login providers
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Summary
13
13. Creating JavaScript Packages
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13. Creating JavaScript Packages
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Writing universal modules
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Writing npm packages
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Publishing a package to npm
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Using Node.js modules in the browser
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Summary
14
14. Node.js and Beyond
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14. Node.js and Beyond
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Understanding Node.js versioning
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Understanding ECMAScript versioning
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Exploring ECMAScript 2015
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Introducing ECMAScript 2016
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Going beyond JavaScript
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JavaScript and ASP.NET
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Summary
15
Index
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Index

Integrating Socket.IO with Express

So far, apart from sharing the same server, the Socket.IO and Express parts of our application are completely independent. While it's good that they are loosely coupled, some cross-cutting concerns may be relevant to both.

For example, both parts of our application should have a mutually consistent way of identifying the current user. This is especially important if they are to come together to provide a single coherent user experience.

First, let's extend our user middleware to provide the current user's name as well as their ID, by looking them up in the user service as given here src/middleware/users.js:

'use strict';

module.exports = (service) => {
    const uuid = require('uuid');

    return function(req, res, next) {
        let userId = req.cookies.userId;
        if (!userId) {
            userId = uuid.v4();
            res.cookie('userId', userId);
            req.user = {
                id: userId
            };
            next();
      ...
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